Tokyo Institute of Technology

Pentel Kabushiki Kaisha

Ngk Spark Plug Company, Limited

Mitsui Minings & Melting Co., Ltd.

Kanagawa Institute of Industrial Science and Technology

Toshihiro Isobe

Shigeo Oka

Ryosuke Uehara

Sachiko Matsushita

Norio Yamada

Akira Nakajima

Takumi Matsumoto

Yuko Hayakawa

Yuri Adachi

Kayano Sunada

A negative thermal expansion material having a negative thermal expansion coefficient according to the present invention is represented by ZrMSPO, where M is at least one selected from Ti, Ce, Sn, Mn, Hf, Ir, Pb, Pd, and Cr; a is 0≤a<2; x is 0.4≤x≤1; and δ is a value defined as to satisfy a charge neutral condition. The present invention makes it possible to provide a negative thermal expansion material, a composite material and a method for producing a negative thermal expansion material that can realize reduction in cost and density reduction.

Negative thermal expansion material, composite material, and method for producing negative thermal expansion material

A complex oxide ceramic according to an embodiment is a complex oxide ceramic including a rare earth element and at least one element selected from among molybdenum, tungsten, and vanadium. An example of the rare earth element is at least one species selected from among La, Ce, and Gd.

Complex oxide ceramic, method for producing same, and article

A knock type applicator includes a cylindrical shell having a coating liquid storage chamber, a writing tip slidably inserted into an opening portion formed in a distal end of the cylindrical shell, and a valve mechanism between the writing tip and the coating liquid storage chamber. The valve mechanism has a valve element connected to the writing tip. Ribs are formed in an inner wall of the opening portion of the cylindrical shell in a lengthwise direction of the cylindrical shell. The diameter of an inscribed circle connecting apexes of the ribs is dimensioned smaller than the maximum diameter of the writing tip. By this, the ribs bite or project into the writing tip which is advanced in combination with the valve element during knocking operation. As a consequence, the writing tip is cracked by the ribs projected therein. At that time, hardened substance, gelled substance and viscous substance created from the coating liquid in the writing tip are peeled off from the fibers of the writing tip, thus recovering an ink flow passage in the writing tip. A connecting force between the writing tip and the valve element is set smaller than a biasing force exerted to the valve element, and a joining distance between the writing tip and the valve element is set longer than a moving distance of the valve element during knocking operation. Thus, the writing tip would not escape from the valve element even if the knocking force is released by mistake when the hardened substance, gelled substance, etc. of the coating liquid is removed from the writing tip.

Knock type applicator

Correction pen

Growing community of inventors

Tokyo, Japan

Toshihiro Isobe